I guess the no reply was a way to say "STFW". And it was a good idea. So, just for the sake of correction, if somebody pass by with the same problem...
Instead of doing dummy request from the url, I use the api with a tool like request-oauth in pyt…
Sorry my knowledge in PHP is not good enough to even consider it ;-)
But after a bit of research I found this fork :
https://github.com/surfnet-oauth2/statusnet-oauth2
If it is working, maybe could be cool to start integrating it.